US6002514A - Integrated light absorber - Google Patents
Integrated light absorber Download PDFInfo
- Publication number
- US6002514A US6002514A US09/095,817 US9581798A US6002514A US 6002514 A US6002514 A US 6002514A US 9581798 A US9581798 A US 9581798A US 6002514 A US6002514 A US 6002514A
- Authority
- US
- United States
- Prior art keywords
- light
- chamber
- integrated
- light absorber
- input port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B6/122—Basic optical elements, e.g. light-guiding paths
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/241—Light guide terminations
- G02B6/243—Light guide terminations as light absorbers
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12083—Constructional arrangements
- G02B2006/12126—Light absorber
Definitions
- This invention relates to an integrated light absorber and in particular to a light absorber formed on a silicon chip.
- Certain features of integrated waveguide circuitry call for the dumping or absorption of light in a controlled manner. Light may need to be confined so it does not escape into the waveguide substrate and is not back reflected into the waveguide from which it came.
- Low reflection terminations for waveguides based on anti-reflection (AR) coated angled facets exist and are successful at reducing back reflections into a waveguide. They are not suitable, however, for beam-dumping because light is released into the substrate rather than being absorbed.
- AR anti-reflection
- the present invention is directed to an integrated light absorber comprising a light chamber integrated in an optical chip, the chamber being defined by upper and lower walls lying substantially parallel to the chip and peripheral walls extending there between and having a light input port in a peripheral wall for receiving light to be absorbed, at least one of the walls having light absorbing properties, the chamber being arranged such that the majority of light which enters the chamber through the light input port undergoes multiple reflections and so is confined within the chamber and absorbed by the walls of the chamber.
- FIG. 1 is a schematic plan view of a first embodiment of an integrated light absorber according to the invention
- FIG. 2 is a schematic plan view of a second embodiment of an integrated light absorber according to the invention.
- FIG. 3 is a schematic plan view of a third embodiment of an integrated light absorber according to the invention.
- FIG. 4 is a schematic plan view of a fourth embodiment of an integrated light absorber according to the invention.
- FIG. 5 is a perspective view from above and in front illustrating how an integrated light absorber such as that shown in FIG. 1 may be formed in a substrate.
- FIG. 6 is a cross-section view on line A--A of FIG. 1 and line B--B of FIG. 5 illustrating how an integrated light absorber such as that shown in FIGS. 1 and 5 may be formed in a substrate.
- the figures illustrate integrated light absorbers in which light in an integrated waveguide 1, such as a rib (or ridge) waveguide formed on a silicon-on-insulator chip, is allowed to escape from an end of the waveguide 1, into an enclosed light chamber 2 integrated on the chip.
- the light chamber 2 is defined by upper and lower walls lying substantially parallel to the plane of the chip (upper wall 3A and lower wall 3C being shown in FIGS. 5 and 6) and peripheral walls 3B which extend there between in a direction substantially perpendicular to the plane of the chip.
- At least one of the walls defining the chamber 2 preferably has light absorbing properties and the chamber is arranged such that the majority of the light which diverges into the chamber 2 from the waveguide undergoes multiple reflections therein and so is absorbed by the walls of the chamber 2.
- peripheral walls 3B of the chamber are preferably arranged so as to reduce the amount of light which undergoes only a small number of reflections before being reflected back into the waveguide 1.
- the upper wall 3A and peripheral walls 3B of the chamber are preferably coated with a light absorbing material.
- the lower wall 3C comprises the interface between an upper silicon layer 7 in which the chamber 2 and waveguide 1 are formed and an underlying insulating layer 8, e.g. of silicon dioxide.
- this comprises the connection between the peripheral wall 3B and the rib waveguide 1.
- this may comprise a portion of the peripheral wall 3B which permits entry of light from some other source, e.g. an optical fibre.
- FIGS. 1-4 illustrate four possible forms of the light chamber 2.
- FIG. 1 shows the most basic form of chamber which has a circular shape. This is the simplest shape to fabricate but has the disadvantage that light entering the chamber 2 on the optical axis of the waveguide will be reflected back to the waveguide by a single reflection from the peripheral wall of the chamber directly opposite the light input port. Other paths involving only three or four reflections by which light can be reflected back to the input port also exist. However, most paths require the light to undergo a large number of reflections before returning to the waveguide 1 so the light reflected back to the waveguide 1 is greatly attenuated.
- a chamber 2 of multi-sided polygonal shape may be used instead of a circular chamber.
- FIG. 2 shows a similar arrangement to FIG. 1 but with an axial spike 4 provided on the peripheral wall of the chamber directly opposite the light input port.
- the spike 4 scatters light incident thereon on the optical axis of the waveguide and so prevents direct back reflection to the waveguide 1 and hence removes the largest cause of light being reflected back to the waveguide 1.
- FIG. 3 illustrates such a chamber in which the peripheral walls making up the star shape are substantially straight.
- the only paths having a small number of reflections by which light can be reflected back to the light input port involve reflections from a point either at the bottom 5 or top 6 of a spike.
- the star shape may have an arbitrary number of spikes but preferably has at least six points and most preferably at least eleven points (as shown in FIG. 3).
- the number of reflections that a typical light ray must undergo before emerging from between two spikes 6, i.e. before emerging from one of the points 5 of the star shape, can be further increased by making the peripheral walls 3B of the points 5 curved, with a substantially parabolic cross-section as shown in FIG. 4.
- FIGS. 3 and 4 can be further improved by providing smaller spikes between the larger spikes making up the star shape, i.e. at the points 5 of the star shape, to further reduce the reflection therefrom.
- This process can be continued by forming further miniature spikes between the smaller spikes and so on substantially in the form of a fractal.
- the peripheral walls of the chamber 2 may comprise projections or irregularities of other shapes besides the spikes referred to above.
- the light absorbing chamber may comprise a series of relatively large irregularities between which smaller irregularities are provided and between which yet smaller irregularities are provided, again substantially in the manner of a fractal.
- the intention is to minimize the probability of light being coupled back into the waveguide by arranging for the light to undergo multiple reflections in the light absorbing chamber and being attenuated at each reflection.
- FIGS. 5 and 6 illustrate how an integrated light absorber such as that shown in FIG. 1 may be fabricated.
- the Figures show the rib waveguide 1 and a circular light absorbing chamber 2 formed by etching away the surrounding areas of the upper silicon layer 7a to expose the insulating layer 8.
- the chamber 2 and waveguide 1 are thus homogeneously formed. Having defined the shape of the chamber 2 in this way, any oxide thereon is removed and the chamber is preferably engulfed in light absorbing material, e.g. by depositing the material thereon in direct, intimate contact with the silicon.
- the upper wall 3A and peripheral walls 3B of the chamber are thus coated with light absorbing material.
- the lower wall 3C is formed by the interface between the silicon layer 7a in which the chamber 2 and waveguide 1 are formed and the underlying insulating layer 8.
- the other forms of chamber shown in FIGS. 2-3 may be formed in a similar manner.
- FIG. 6 additionally shows the relationships among the upper wall 3A, the upper silicon layer 7a, 7b in which the chamber and waveguide are etched, the peripheral wall 3B, the lower wall 3C, the insulating layer 8 and an underlying silicon substrate 9.
- the light absorbing material may be a metallic coating, e.g. of aluminum, typically 1-2 microns thick, or some other light absorbing material such as an infra-red absorbing glob top, e.g. formed of an epoxy or polymer material, as used in component encapsulation.
- the light absorber may be formed on a silicon-on-insulator chip which comprises an upper layer of silicon 7a, 7b separated from a substrate 9, e.g. also of silicon, by an insulator layer 8, typically of silicon dioxide.
- the waveguide 1 and light absorbing chamber 2 are etched in the upper layer of silicon 7a, 7b.
Abstract
Description
Claims (22)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9712011A GB2314643B (en) | 1997-06-11 | 1997-06-11 | Integrated light absorber |
GB9712011 | 1997-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
US6002514A true US6002514A (en) | 1999-12-14 |
Family
ID=10813883
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/095,817 Expired - Lifetime US6002514A (en) | 1997-06-11 | 1998-06-11 | Integrated light absorber |
Country Status (10)
Country | Link |
---|---|
US (1) | US6002514A (en) |
EP (1) | EP0988568B1 (en) |
JP (1) | JP2002505012A (en) |
KR (1) | KR20010013679A (en) |
CN (1) | CN1261440A (en) |
AU (1) | AU7779898A (en) |
CA (1) | CA2293644A1 (en) |
DE (1) | DE69809231D1 (en) |
GB (1) | GB2314643B (en) |
WO (1) | WO1998057205A1 (en) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6525864B1 (en) | 2000-07-20 | 2003-02-25 | Nayna Networks, Inc. | Integrated mirror array and circuit device |
US20040020896A1 (en) * | 2002-02-15 | 2004-02-05 | Lockheed Martin Corporation | Tapered optical fiber for fiber to waveguide interconnection |
US6771851B1 (en) | 2001-06-19 | 2004-08-03 | Nayna Networks | Fast switching method for a micro-mirror device for optical switching applications |
WO2004083915A1 (en) * | 2003-03-15 | 2004-09-30 | Qinetiq Limited | Variable optical attenuator comprising hollow core waveguide |
US20050089262A1 (en) * | 2002-01-29 | 2005-04-28 | Jenkins Richard M. | Optical circuit fabrication method and device |
US20050105842A1 (en) * | 2001-12-27 | 2005-05-19 | Vonsovici Adrian P. | Integrated optical arrangement |
US6970611B1 (en) | 2003-08-27 | 2005-11-29 | Kotura, Inc. | Optical component having reduced interference from radiation modes |
US20060215954A1 (en) * | 2004-03-22 | 2006-09-28 | Jenkins Richard M | Optical routing device comprising hollow waveguides and mems reflective elements |
US20090185776A1 (en) * | 2008-01-21 | 2009-07-23 | Japan Aviation Electronics Industry Limited | Optical Device |
US7689075B2 (en) | 2003-03-22 | 2010-03-30 | Qinetiq Limited | Optical wavelength division multiplexer/demultiplexer device |
US20220196913A1 (en) * | 2020-12-21 | 2022-06-23 | Unm Rainforest Innovations | Ring-Geometry Photodetector Designs For High-Sensitivity And High-Speed Detection Of Optical Signals For Fiber Optic And Integrated Optoelectronic Devices |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2581774A1 (en) * | 2011-10-14 | 2013-04-17 | Astrium Limited | Suppression of back reflection in a waveguide |
JP6578670B2 (en) * | 2015-02-25 | 2019-09-25 | 株式会社島津製作所 | Laser beam damper and laser apparatus using the same |
CN107430243B (en) * | 2015-02-28 | 2020-08-14 | 华为技术有限公司 | Optical waveguide terminating device, optical communication equipment and method for terminating optical wave |
CN111352187B (en) * | 2018-12-21 | 2022-05-20 | 中兴光电子技术有限公司 | Waveguide terminator, optical communication device and optical terminating method |
CN115463816B (en) * | 2022-09-20 | 2023-11-07 | 暨南大学 | Optical fiber ultrasonic transmitting device and preparation method |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60186807A (en) * | 1984-03-07 | 1985-09-24 | Furukawa Electric Co Ltd:The | Terminal structure of optical fiber |
US5018813A (en) * | 1990-05-01 | 1991-05-28 | Eastman Kodak Company | Multichannel integrated optic modulator for laser printer |
EP0598966A1 (en) * | 1992-11-24 | 1994-06-01 | International Business Machines Corporation | Optical waveguide isolator |
US5321779A (en) * | 1992-11-06 | 1994-06-14 | The Charles Stark Draper Laboratory, Inc. | Optical substrate with light absorbing segments |
US5337377A (en) * | 1992-12-15 | 1994-08-09 | Seikoh Giken Co., Ltd. | Optical fiber termination device |
US5559912A (en) * | 1995-09-15 | 1996-09-24 | International Business Machines Corporation | Wavelength-selective devices using silicon-on-insulator |
JPH08334649A (en) * | 1995-06-08 | 1996-12-17 | Nippon Telegr & Teleph Corp <Ntt> | Optical terminator |
JPH095548A (en) * | 1995-06-19 | 1997-01-10 | Nippon Telegr & Teleph Corp <Ntt> | Optical waveguide circuit |
JPH09326502A (en) * | 1996-06-06 | 1997-12-16 | Nippon Telegr & Teleph Corp <Ntt> | Superluminescent diode |
-
1997
- 1997-06-11 GB GB9712011A patent/GB2314643B/en not_active Expired - Fee Related
-
1998
- 1998-06-03 JP JP50185499A patent/JP2002505012A/en active Pending
- 1998-06-03 CN CN98805886A patent/CN1261440A/en active Pending
- 1998-06-03 WO PCT/GB1998/001621 patent/WO1998057205A1/en not_active Application Discontinuation
- 1998-06-03 AU AU77798/98A patent/AU7779898A/en not_active Abandoned
- 1998-06-03 CA CA002293644A patent/CA2293644A1/en not_active Abandoned
- 1998-06-03 DE DE69809231T patent/DE69809231D1/en not_active Expired - Lifetime
- 1998-06-03 EP EP98925823A patent/EP0988568B1/en not_active Expired - Lifetime
- 1998-06-03 KR KR1019997011691A patent/KR20010013679A/en not_active Application Discontinuation
- 1998-06-11 US US09/095,817 patent/US6002514A/en not_active Expired - Lifetime
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60186807A (en) * | 1984-03-07 | 1985-09-24 | Furukawa Electric Co Ltd:The | Terminal structure of optical fiber |
US5018813A (en) * | 1990-05-01 | 1991-05-28 | Eastman Kodak Company | Multichannel integrated optic modulator for laser printer |
US5321779A (en) * | 1992-11-06 | 1994-06-14 | The Charles Stark Draper Laboratory, Inc. | Optical substrate with light absorbing segments |
EP0598966A1 (en) * | 1992-11-24 | 1994-06-01 | International Business Machines Corporation | Optical waveguide isolator |
US5463705A (en) * | 1992-11-24 | 1995-10-31 | International Business Machines Corporation | Optical waveguide isolation |
US5337377A (en) * | 1992-12-15 | 1994-08-09 | Seikoh Giken Co., Ltd. | Optical fiber termination device |
JPH08334649A (en) * | 1995-06-08 | 1996-12-17 | Nippon Telegr & Teleph Corp <Ntt> | Optical terminator |
JPH095548A (en) * | 1995-06-19 | 1997-01-10 | Nippon Telegr & Teleph Corp <Ntt> | Optical waveguide circuit |
US5559912A (en) * | 1995-09-15 | 1996-09-24 | International Business Machines Corporation | Wavelength-selective devices using silicon-on-insulator |
JPH09326502A (en) * | 1996-06-06 | 1997-12-16 | Nippon Telegr & Teleph Corp <Ntt> | Superluminescent diode |
Cited By (19)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6525864B1 (en) | 2000-07-20 | 2003-02-25 | Nayna Networks, Inc. | Integrated mirror array and circuit device |
US6771851B1 (en) | 2001-06-19 | 2004-08-03 | Nayna Networks | Fast switching method for a micro-mirror device for optical switching applications |
US20050105842A1 (en) * | 2001-12-27 | 2005-05-19 | Vonsovici Adrian P. | Integrated optical arrangement |
US20070165980A1 (en) * | 2002-01-28 | 2007-07-19 | Qinetiq Limited | Optical circuit fabrication method and device |
US7428351B2 (en) | 2002-01-29 | 2008-09-23 | Qinetiq Limited | Optical circuit fabrication method and device |
US20050089262A1 (en) * | 2002-01-29 | 2005-04-28 | Jenkins Richard M. | Optical circuit fabrication method and device |
US20040020896A1 (en) * | 2002-02-15 | 2004-02-05 | Lockheed Martin Corporation | Tapered optical fiber for fiber to waveguide interconnection |
WO2004083915A1 (en) * | 2003-03-15 | 2004-09-30 | Qinetiq Limited | Variable optical attenuator comprising hollow core waveguide |
US20060104592A1 (en) * | 2003-03-15 | 2006-05-18 | Richard Jenkins | Variable optical attenuator comprising hollow core waveguide |
CN100385274C (en) * | 2003-03-15 | 2008-04-30 | 秦内蒂克有限公司 | Variable optical attenuator comprising hollow core waveguide |
US8494336B2 (en) | 2003-03-15 | 2013-07-23 | Qinetiq Limited | Variable optical attenuator comprising hollow core waveguide |
US20110164845A1 (en) * | 2003-03-22 | 2011-07-07 | Qinetiq Limited | Optical routing device comprising hollow waveguides and MEMS reflective elements |
US7689075B2 (en) | 2003-03-22 | 2010-03-30 | Qinetiq Limited | Optical wavelength division multiplexer/demultiplexer device |
US8165433B2 (en) | 2003-03-22 | 2012-04-24 | Qinetiq Limited | Optical routing device comprising hollow waveguides and MEMS reflective elements |
US6970611B1 (en) | 2003-08-27 | 2005-11-29 | Kotura, Inc. | Optical component having reduced interference from radiation modes |
US20060215954A1 (en) * | 2004-03-22 | 2006-09-28 | Jenkins Richard M | Optical routing device comprising hollow waveguides and mems reflective elements |
US7792399B2 (en) * | 2008-01-21 | 2010-09-07 | Japan Aviation Electronics Industry Limited | Optical device |
US20090185776A1 (en) * | 2008-01-21 | 2009-07-23 | Japan Aviation Electronics Industry Limited | Optical Device |
US20220196913A1 (en) * | 2020-12-21 | 2022-06-23 | Unm Rainforest Innovations | Ring-Geometry Photodetector Designs For High-Sensitivity And High-Speed Detection Of Optical Signals For Fiber Optic And Integrated Optoelectronic Devices |
Also Published As
Publication number | Publication date |
---|---|
GB2314643B (en) | 1998-06-17 |
GB9712011D0 (en) | 1997-08-06 |
CA2293644A1 (en) | 1998-12-17 |
KR20010013679A (en) | 2001-02-26 |
EP0988568A1 (en) | 2000-03-29 |
DE69809231D1 (en) | 2002-12-12 |
WO1998057205A1 (en) | 1998-12-17 |
EP0988568B1 (en) | 2002-11-06 |
AU7779898A (en) | 1998-12-30 |
JP2002505012A (en) | 2002-02-12 |
GB2314643A (en) | 1998-01-07 |
CN1261440A (en) | 2000-07-26 |
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